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一.实际业务逻辑

订单系统中使用MQ（不写订单系统逻辑）

1.项目的创建和准备

1. 先把空项目创建好
   
2. 在空项目中创建其他的spring项目

3. 创建新的spring项目在这个空项目中
   
4. 项目创建好会出现一个文件包
   
5. 有些情况下需要手动添加Maven
   
6. 在里面选择Maven后，项目就能够使用XML配置文件了
   

2.代码实现

Controller

package com.example.orderservice.controller;import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.util.UUID;@RequestMapping("/order")
@RestController
public class OrderController {@Autowiredprivate RabbitTemplate rabbitTemplate;@RequestMapping("/create")public String create() {String orderId = UUID.randomUUID().toString();rabbitTemplate.convertAndSend("","order.create","订单信息，订单ID: " + orderId);return "ok";}
}

Configuration

package com.example.orderservice.config;import org.springframework.amqp.core.Queue;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.amqp.core.QueueBuilder;@Configuration
public class RabbitMQConfig {@Bean("orderQueue")public Queue orderQueue() {return QueueBuilder.durable("order.create").build();}
}

properties

spring.application.name=orderservice
spring.rabbitmq.addresses=amqp://账号:密码@IP:端口号/虚拟机

二.物流系统使用MQ（不实现物流系统业务）

1.项目创建同订单（一样）

2.代码实现

properties

spring.application.name=logistics
server.port=9090
spring.rabbitmq.addresses=amqp://账号:密码@IP:端口号/虚拟机

Listener

package com.example.logistics.listener;import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;
@Component
public class OrderListener {@RabbitListener(queues = "order.create")public void handMessage(String orderInfo) {System.out.println("接收到订单消息: " + orderInfo);}
}

使用对象来发送接收消息

生产者（订单）代码

Controller

@RequestMapping("/order")
@RestController
public class OrderController {@Autowiredprivate RabbitTemplate rabbitTemplate;@RequestMapping("/create")public String create() {String orderId = UUID.randomUUID().toString();rabbitTemplate.convertAndSend("","order.create","订单信息，订单ID: " + orderId);return "ok";}@RequestMapping("/create2")public String create2() {OrderInfo orderInfo = new OrderInfo();orderInfo.setOrderId(UUID.randomUUID().toString());orderInfo.setName("商品 "  + new Random().nextInt(100));rabbitTemplate.convertAndSend("","order.create", orderInfo);return "ok2";}
}

Configuration

@Configuration
public class RabbitMQConfig {@Bean("orderQueue")public Queue orderQueue() {return QueueBuilder.durable("order.create").build();}@Beanpublic Jackson2JsonMessageConverter jackson2JsonMessageConverter() {return new Jackson2JsonMessageConverter();}@Beanpublic RabbitTemplate rabbitTemplate(ConnectionFactory connectionFactory, Jackson2JsonMessageConverter jackson2JsonMessageConverter) {RabbitTemplate rabbitTemplate = new RabbitTemplate(connectionFactory);rabbitTemplate.setMessageConverter(jackson2JsonMessageConverter);return rabbitTemplate;}
}

model

@Data
public class OrderInfo implements Serializable {private String OrderId;private String name;
}

消费者（物流）代码

Listener

@Component
@RabbitListener(queues = "order.create")
public class OrderListener {@RabbitHandlerpublic void handMessage1(String orderInfo) {System.out.println("接收到订单消息String: " + orderInfo);}@RabbitHandlerpublic void handMessage2(OrderInfo orderInfo) {System.out.println("接收到订单消息OrderInfo: " + orderInfo);}}

Configuration

@Configuration
public class RabbitMQConfig {@Beanpublic Jackson2JsonMessageConverter jackson2JsonMessageConverter() {return new Jackson2JsonMessageConverter();}@Beanpublic RabbitTemplate rabbitTemplate(ConnectionFactory connectionFactory, Jackson2JsonMessageConverter jackson2JsonMessageConverter) {RabbitTemplate rabbitTemplate = new RabbitTemplate(connectionFactory);rabbitTemplate.setMessageConverter(jackson2JsonMessageConverter);return rabbitTemplate;}
}